BlocZanswered grow question 3 months ago More broadly, during combustion, there is black smoke when there is an incomplete combustion of gases escaping from the material. For hash, I think it corresponds to the moment when the heated material is released a lot of gas, a lack of oxygen prevents complete combustion and creates this black smoke. Once combustion has stabilized, oxygen is present in sufficient quantities for complete combustion.
You have to look on that side I think 😉✌️